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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be0ae89aee36e6dc204b4072bca23398665641368ba51ae8f72ce96854bcddf' 
  AND token = '5yFwNfUjTYf6enGSCFrfrmt/umFGQbYX5G1qRSFbZ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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