SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138c64b7cb312f5e59fef182f9998d6b23f2552541a3333c39909ab987457546' 
  AND token = 'PqxHph7OvtDg4/vjMNhfYuIpNYSbQn/rmG7F/4aJva4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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