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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441698ac3bed5e07a830a9bce3979b65b0c5701dc89d8c99155c368b0c2de165' 
  AND token = 'lr8NvR1rARvbyrxtkoFNeJdsWqzs9TxQ9b72COCAx9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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