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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99fb889e6116ee9ecd9b65cc625b328de29a1dd4f186cdf7ae04078352499e5' 
  AND token = 'nrXJe5Jj/PhPirm3xzA0KPvKqeUttU7h6jkN49FBJqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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