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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f560827db89c0fc16e414175341d6a72abdf22a25b9624ad5b561dbcfc09e56' 
  AND token = 'TBruemYffZhGIxaXSj6RyUIoG1eNcKinq8pZAV2ELzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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