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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf47bf775161791c2f69bbed76afbd938718847fe9ca8306fe714b4fc52b8db0' 
  AND token = 'vQT/8Zz5T1w2mY5+xTR7vcnsi+Ll2cxKeuRMyH9X2FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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