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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896e3a29a9b5a5fed66313c96be3a8ffbd90f05770f48f2acacc33f5ede35fa0' 
  AND token = 'pQTZY5e6lYY1aEJKliCfxHvde+ClHa+WqliwIeos/PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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