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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8926a673b3077384f83378022a40899a889d0adc3acbd7146cd1815cca9202d1' 
  AND token = 'RxGTzgY9xioTvUupt7R85G/4HV09QvC6nFuLF6QAcUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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