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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda56a219b6a2fcecdd852f44b97d30a931bf520bbc44b6d7b9af1d723d9a6ab' 
  AND token = 'dcnu9VFOPcmcT0RjtY6bz3q94Iv5Ort0OWWgxolx73Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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