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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b9077e5b5e1e18fc36d6347929f6d5cc9a6780aaec8593ba55d679332c806c' 
  AND token = 'kYnSw18ktHoWqeL6ZUfk16dz9fxcuKEuEUpa0CNFuq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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