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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c001ba65ee86a08ccac2cf945005589a8bb828bc1790849671ee685cff80b970' 
  AND token = 'iNFE4EO/dsQBh1iCFI153f++W66ITtj0GrzP+Fuyz7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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