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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77842c8e845c06a71c11ae2bf80297ad333dcc7551978c2ecf9f38fd3f738df2' 
  AND token = 'KQ/3V+7HaT30MsKoe5vDfGS4mNvcH9E/R3/6vjcj+ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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