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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af47fbc5a67bca6f0830170c697dbef41dd307ec4b2e53dea2d381513c025ac' 
  AND token = 'WeWcGukALtnaxthH+9axhmxp+p8lfJ36xEs1jHM3Qoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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