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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ae47ae375ce31db83b52b017736bb7d545e67937cc714e641839fe8d080daf' 
  AND token = 'acyhIsv2SFvMegNrR4fR7wIIwhomQtjW2Xk3Z+cNDw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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