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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c10641515e7e39d01ceebb0235fd323b6dc2727014f6aa98a1394e72826a728' 
  AND token = 'zIXP5AjnBOulu9rmt4Um67lUWJ9Wkqu0emcDsN2MNTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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