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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253af415d0c06d470ed6777bfa48baa7917bdff62349e673c7d2be6764951a51' 
  AND token = '9l7l6VqnEYoQtpBTNapoi0JV4d+oSovitzZtnKv1Y1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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