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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33c278362d65e3ec46eb4dddf15cfe2b9197e2ffe9a3a598a6bf03575bf478f' 
  AND token = 'hImb6UpfzMa2pofTLPxKCexZ1NphKGHpm6QiPQKiASk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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