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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdce5c838c3172c86bbe66b876c0af32dc60c6e71e019a11070bcad997cc6bad' 
  AND token = 'n52WsEjt1wTMqJtZQr2zgZL/qGo7EiG3+5ylFLZxhEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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