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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c54fd00055de53fc2da503e4256169c67fe6c75825a4b5512ae2db3b82d715d' 
  AND token = '4iiPAMWeSbnsXgIXT01KKe6bp2mRbtLZ/KiOhKExAE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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