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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2ea74eecf42cb5d9f71dadb4ea5a8ac85b84e843eb9a77b201cf77a54e35f0' 
  AND token = 'Cg2p1e9oRpz3f4PKt0lUAuIfxjNYg9wSPk99Yivb9yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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