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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3713584bfc8428aa0b6d0ca48e644e2acb97b456ac30e43deacb0339b42dcb46' 
  AND token = 'Lj3/sHf5nflTWx8rH9s0jH//HXn+UoerRKbEtQ/4A7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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