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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546c50f899aa55c9c54d88cc55ffa43554f69bfcdd1f8ea685ee10bfcda892ca' 
  AND token = 'gNUdKL2txJlCOtlqGXYweof/5x07whsxOQXtmOq+ErE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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