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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06378dd83d66c628cdf10d71782fca15709e72758ad7f6a7a81b5969a54f674f' 
  AND token = 'tqAIXP3lYDi3+uYptfFGWNKGAiGUF4iGLMgb2k4zNCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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