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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cfd17a18c106fc2c7eb3c5861ba254adf4d79490747cde6cd6cc9b005a8c21' 
  AND token = '00wkajxRQyKFVhsh7jbA6Fkx17c0VXriwNkxvzPJ2kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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