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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941e6a2eb7234a46c9093c76e4549df511d384e3480a6617f05bc4a6dea3c378' 
  AND token = 'bXgM4ZRmXhR3NFXvhmc/ZMkh+JXI56K6OVvm8M/9rZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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