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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1a264b88c3123197083c7c6cc570034d37eb679f27b2283ed5877a5709f257' 
  AND token = 'djsIPew8cc9SpViflzxxHdknqE+vo/2Bbw9Iei3yTf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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