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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57423bd1fc4c422a5fabb6a47ed8b31fa7a316246830e6c88522ae2348798a26' 
  AND token = 'rn4KYrcf1bcxm3ZW1pAzNr/tHZGh5ZGsIQ6tokoL0rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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