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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c295dc1cb715a1d601f37b93249861126c4c3eb90d61bb77922ab3ee92942d' 
  AND token = 'Lnix7ZuXBEfkimEozH+S3+EMxHiP/ymrUuMVYtk/27c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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