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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84d919b663c958d1a380a043d9ec5d5ea25a6c0b3c2119046337a720dae327a' 
  AND token = 'IsVg6dDwSfblYJW/0TX3zGgZWn+yCPS25EUH99oU5Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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