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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30716620ad32ca06b0d604ec76d049618f902e2cccf95402d7cc167a5c6f0c8' 
  AND token = 'yTGvmZnSu991CTqnF6MBwHJDwYsNb2mQhKzdUSknlpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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