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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068b2f4ce1c446419475ce873f2d0f011e381bdff503725a8f78ebbf4886d774' 
  AND token = 'gDsr2+KyWNzLI079XbbEQu8EhXGOry270szBMWTXznE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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