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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb56500c504a253aa8d5e356c92b7d2cf4fd32290a81b5b9b5d208a6e2263f6' 
  AND token = 'Pq4GTnJyiHgTjt8dpEgjOg2ktq6FgGhMtq612RF/iiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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