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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a247090830580a654f191fa33fa229e64a93e29d87ba7a7872bbd784ef8096f1' 
  AND token = 'SwhNMS97dVjqgR3ywk/Hh21qlPew3NQkw1yIV+9knBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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