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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd205cc6feb03d0a30bd0adc3a0daee085cc3f3871b88914f9694c532f91f3cb3' 
  AND token = 'whhm3aSyw1sY4w3t3oq8Lqu0DPN4kdL1mw85jYTPfms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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