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SELECT 
  1 
FROM 
  csscart_lock_keys 
WHERE 
  key_id = '7d1f26b8a5eb4e8e119e25019f50a3d05f0c627d1dd3edfc40b0907ad555b768' 
  AND token = '0BDpO2/2tRxxa1i7CizZ05iMI3zBRR9rL7geIXOztHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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