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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115cd889f66af58cbce92c8c50367b4c3b150629e33a0113e967ecd81835e7dd' 
  AND token = 'f2tg3yoNwnFeP+kR7Qya3PW7Q1vvcXPOWwF6QdfTPz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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