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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a47f8ba23b01231abaf9f00579a264b9c96bf8a4c44c5849a7daa36c8fb2db' 
  AND token = 'UmhXtS+ce9HjjtMIMW60wVCLbTfZnYp8sfUKrlq49K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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