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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fc747bcd594213fbdaa4fae81a8182bfba6f05177191c18babbfd5650ceece' 
  AND token = 'nL9sSeZuGcW6igKOY1rrLG014pXQzCqF/EWBu2VD8p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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