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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98419a3359af4451c7b8a8ea522c1cc6109f6bc681da6ad90110cb9db04fc92c' 
  AND token = 'jeRWIRrR9emRhLjKatwxA9XH3MH5s9u+AUd1h1N4sKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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