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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe9466590c2ecd7320c2c77fe79f989aaf0a055f27780abede3ad991f66dfd0' 
  AND token = 'gt6eDZ/2aiRKixKqBRYhNX7OCGO/0dOGyv0Fg6sylGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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