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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa323de46f9bb73d42ef6adebb3e8a34c028f5790f7c9850e8ff2aa0a9f1b2f' 
  AND token = 'Fxy1lZpAxExB2Qwh/K3PcFK1DIDdCDI4rECmqZoOiE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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