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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da6cd7b920ba3332b7e39c3eee953b027f43e9b4eb7bf948f8da91d4baf64c4' 
  AND token = '5rz5YZm1KiGeFo50O+FUbV7Cpm4aHeRtKeqmJUXZJn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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