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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c37efb04554f7b7ae5d6da63e01cafb327099342150680e0b82e802d0a1619' 
  AND token = 'd+Ckq5nF93iMhXj8Njs+DkmaGh9vrCzeSpNE9tfqYp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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