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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85afea741223b91b5eafa321a3a7b07f37874bac13111232d65efb0a38014f2d' 
  AND token = 'ftk1CQeX7MzYdOy61Bje4tJ35aMG9Oy1Dbm6Cvr/ZZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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