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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98ac6fd707923b02bfdb50c25b7850db9717939c7685bd9f7aa2e7de953f04d' 
  AND token = 'LxJ4FuHch4ite7xEoUi6rGnFJX7SFasT400lV6NH5/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}