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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5d71fbee90a393241d8dfd36ff9b4b712fc89aede3a776ec112da6b1f36ec1' 
  AND token = 'puS29tNx8Lv+NsvCShetKawUHClCRMOgooBSvaNE/II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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