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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba3274b968ee190b1a88588bd2c071ebd6dd6201a10d42ae20ecd1a88cadf70' 
  AND token = 'c/LRmzuc2+WaOXud0OQ7UpJGHBW1Tv/g2FCG9QLP2Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

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