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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36802c8eeb507c2ab17df4bb2882cf81e6b5f766214f4fb2ed767f48218601e' 
  AND token = 'AXPDchbibz7V3GAN8nCh64/HD849DvTxH5Wl33+V0AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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