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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0fa4826a45d940b8e954c8573b9e1ef5b5cba57bff1557a47791a29a2c1340' 
  AND token = 'CRye/q3NKSeeQ4zB/Js2QuD/h6osvqvBJQnkyogqees=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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