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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc58c317ac46ee89b41e754564e09c41a876550687ef8a457008c7362fc335c' 
  AND token = 'DGely0Nyrddq2pZmvT13Pjd+h2nNJMan2W0Nf0I67/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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