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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4a04efbbaa6d8049e0f7390adec9c242d133d7a644f7808ae1b6a3bff94607' 
  AND token = 'FzeZ17dgxb7URFdfuLrCQ6wsFwJ6/77ZLwcb9WK6Cok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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