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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccaeb71ed7c3079cd8aa95d4aa06a75bb0b7be53dc5043de49733d6beb09ec0' 
  AND token = 'w8BQUFHTav59NAfWW2BzMDGIjRZcVx9Uj6i9QdB92Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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