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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0f8c73227dc66d487879b05435286ed298c36c33c20a3b795f52fa1b8a1992' 
  AND token = 'gwO4IeymRa57i4Ezj7ahkNGi+BfgHM+J6POtOk2iOHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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