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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8992043b5328937f5cabbebc709faab6b5a3f93898f493c238cf35a957849b27' 
  AND token = 'K1/2HFmYjrwa9Q7VGsIskF7y54l8i7sjnLzjKKXnLjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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