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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27969d920bc981dd9f6f0e411ff706270e24c35c87cde5476402827d1edc12c' 
  AND token = 'QxhnuHuyFnHd3jOe2L8d2PusC3M6Hbq08HTZK/mMUTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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