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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3b09b1ff96667237ee6d64e2bfa7d7da8740252b7d9096efb0e2c4a01d2f54' 
  AND token = 'YfXCPx49pF7ro9B+6AAmEz6INe3J0ar2fHHwm8S2DHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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