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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b1de317a751aa9a04efb1ee0df658c39fc474c0d225a3342daf07c97d9412e' 
  AND token = '18E3UJuPqFx5/4Lgziv4zMaozZ+5myGphG+Uh7esPzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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