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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f046fe434ce698abf27090bf3562aa9d0214a795ad3cc9ad48b2e6a0ae42e97' 
  AND token = 'jJ8PeRV5yAG8l/p+8y+brzhfBE+Huyu6bgCRJdR1P1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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