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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8c5faf8fb5420f377edb6eea7eaa0726da6b9a9742f1bb70711d801bc0a374' 
  AND token = 'gGBVTODW6oL529yowQZv+cM2m2cBhnbHqvP1E07ymWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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