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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e699ccac8c5df1edc6b83783020e6aa142a850c1af63fc9759119a8478b3068' 
  AND token = 'hHOGTpu7e+61WERfILS/VyGJJ5OisVxGUugy+H5Gn6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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