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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1fcf9d301a43e3d74f4f3918c8d6077c995a6a59168b431da5a2c6ef78d6d65' 
  AND token = 'u7YfUQjHrXOC3tEJDgvn9IXvxnTmCkG98PEO5yKkfBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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