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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be3cddb66912dc95210a89eadef186404eea5adbc7d6d4306fc602d9cfa1c4e' 
  AND token = 'yY3BJpnlwMtLRUUqNNQkfGE6HkJ1l5r1t/o+wUUXIsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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