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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da269a875b3ad7709c0c90c6fd7ba9ad475db5a6b25c87f5198e60b4d10812e' 
  AND token = '+HmviFaG9ExSNMNZMqx3A4Pa39Nq3nkkbD0YnNhRYhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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