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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5692c008d1e0c10a3a2e2b1286cd7ab9a575cad4d92346cc64d676b0547e9211' 
  AND token = 'lueI3iJexUyNEJ9jq7ZWOIM/NsTuBgGdYFnmJQ8UsAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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