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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19ef7d8efaf91b6aee57a6f3af49dcf1c8f4033c86b9f79088dce5b936cf3e7' 
  AND token = 'yRTkgNwo4v439T7CSm0xW+BI7BtPb2PkLhvpzyd4VNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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