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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b8da32619bc6ed2aded74fdc9b1c10665fd8d4e40cf60bcecd7c1bf9d4be21' 
  AND token = 'yZmOg0XtTtWi/XfECpp/dKBO99naMRVc4qRJoPkv+ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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