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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd759f11c098b6a0ec1a37f17634ffd5a39f50716e90a1eeb8e4e827772abcc' 
  AND token = 'eiEvD7zVmqAJDfcDpWrFrScdWq/ECKfzMD5m9IXLCDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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