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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a704f78fe388c9a228589bc25ec3f03c484f2c2bb7c2f51ec0c84855e01d9fce' 
  AND token = 'Ia1GIPv93J7EAyo//vCjndyru5oReQSWniN5N+a+a0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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