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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250d88744c8d713a3cf7d9937d5cf19e085ec96207d8cf26bc24e85fd4efbce7' 
  AND token = '8yPDs5UmQdHbGd8XDY5Goxxy+/uQyRis3XPHHY9TJ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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