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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461a8684a495b57a456db6f76386778611f912f9b2114601c27ded98bbe919a0' 
  AND token = 'EU3ig1jsujh8N7gWhCFczjJPT6UUMO6Mvt7zjC6L2sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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