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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3434682da00582a69aaa2f241570a50fb8e45c2423d0c28d462ff7a69f4dd89c' 
  AND token = '29hgQkI3Ma1p0iR5yoatjeOELByqR7TqoWeoRuf77jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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